Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a0c76560027f89…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 19:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 171bd647fb91e012e8ac44a45a9f5157 SHA-1: d1cb559a671f7cfbb2fff4b71d3d87b9f3fcf934 SHA-256: c1a0c76560027f89cab23d0d45d4599ccb883258eeee5bdf82d1d21248100fa9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('midufefew.ru' and 'getveran.site') that are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/award?keyword=catholic+rosary+prayers+in+english+pdf PDF link annotation
    • http://getveran.site/zokajonubizisu20u9j.pdfIn PDF document text
    • http://carins.info/47159500394yvbxc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_5fd22c9b8fde0.pdfIn PDF document text
    • http://merexazumebenag.medianewsonline.com/memik.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/1075590.pdfIn PDF document text
    • https://tolakuvekefub.weebly.com/uploads/1/3/5/2/135296469/3f2b16a7e92.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/332a9987126ea.pdfIn PDF document text
    • https://vifewilepame.weebly.com/uploads/1/3/4/0/134012930/fe42ac6f3f6b.pdfIn PDF document text
    • http://nonretloli.site/nitituvanuwudugerw915.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/jotaxomo.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/accident_and_emergency_radiography.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5ffe18030966c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_5fdac877a9da3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5ffbb9b45a5e4.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/c_al_programming.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/e3a51b770f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tonataf.epizy.com/android_collapsing_toolbar_shadow.pdfIn PDF document text
    • http://janeresofopojaz.epizy.com/set_default_parameter_value_in_crystal_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5328 bytes
SHA-256: 986c59e275dfc9486fee7acad5c02ebd7ced836c9dc3e639d874b6b733a97469
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 11552 bytes
SHA-256: e2090ff49debb02d3b3ffbdafffbb88a2d72fb9af0ecbebcb80af6584c0dc957
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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